Gas-drier.



c. A. PFAN STIEHL. GAS DRIER; APPLICATION FILED JULY 24; 1916.

1,21,064. Patented 0%. 8,1918.

winesses:

- new and useful Improvement in UNITED STATES PATENT OFFICE.

CARL A. IPFANSTIEHL, 0F HIGHLAND PARK, ILLINOISpASSIGNOR '10 PFANS'IIEHL COMPANY, INC., OF NORTH CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK.

GAS-DRIER.

Specification of Letters Patent.

Patented Oct. 8.191s.

Application filed July 24, 1916. Serial No. 111,050.

To all whom it may concern:

Be it known that I, CARL A. PFANSTIEHL, a citizen of the United States, residing at Highland Park, in the county of Lake and State of Illinois, have invented a cerain as- Driers, of which the following'is a full, clear, concise, and exact description, reference being hadto the accompanying drawings, forming a part ofthis specification.

My invention relates to hydrogen gas drying apparatus and comprises a long and slender tank arranged vertically and adapted to have hydrogen gas passed through it from the base upward. The object of my invention is to provide a tank which shall be economical in its operation and one which shall be 'of sufiicient size and convenient form for dryin hydrogen in large quantities, and which 1s circulated at'a high speed and under a considerable pressure.

My invention is illustrated in the accom panying drawings in which,

Figure 1 is an elevation; Fig. 2 is a section on the line 22' of Fig. 1; and.

Fig. 3 Fig. 1.

Tanks of this character are used for dry- 'ing hydrogen in large quantities when used in a COIltlIlllOllS circulating system. for reducing tungsten trioxid to metallic tungsten powder. It has been found that by maintaining a high velocity of hydrogen over the tungsten trioxid powder in a reducing furnace the reduction takes place in much shorter time and with more even results than if the hydrogen is brought into contact with the powder with an insufiicient velocity to carry ofi all of the moisture produced by the reduction before it has had an opportunity to again unite with the heated tungsten. The hydrogen drying-tanks of the prior art, so far as I am aware, were designed to dry hydrogen only in comparatively slowly movin quantities and were not, as is my inventlon, arranged for economically. drying large quantities of hydrogen gas in an elficient manner and without frequently changing the contents of the drying tank.

The tank of my invention is about three feet in length, is preferably made of iron pipe, and is provided with observation windows and also with a detachable metal well is a section on the line 3-3 of for collecting the moisture. The tube if has threaded upper and lowerends, the upper.

end being provided-with a cap 5 into which extends t e hydrogen egress pipe 6 connected with suitable couplings, not shown, to the hydrogen circulating system. The cup or well 7 is threaded into the lower end" a of the pipeand is provided with a shoulder.

8 for the abutment of a gasket 9 which serves to prevent the leakage'of gas, which isv preferably circulated; under pressure. Near the bottom of the tube 4 is a suitable hydrogen ingress tube 6' below which is a series of cross wires l0 which supports a screen 11 the purpose of which is to revent the calcium chlorid from falling into the liquid well before it has become thoroughly dissolved. At several points throughout the length of the tank observation windows 12 are provided, these being mounted on the ends of short projecting tubes 13,the inner ends of which are threaded into the main drier tube 4.1 A cap 14 holds-the observation glass into firm contact with the gaskets 15 and 16 .by means of whichthe esca e of gas around the window 12 is prevents 'In the operation of the device the tube is filled from screen to top' with lumps of dehydrated calcium chlorid, phosphorous .pentoxid, .or other deliquescent material. As

the moist hydrogen passes into the tube through the ingress p1pe 6 that portion of the calcium chlorid nearest this pipe is first dissolved by the moisture carried by the gas. As the gas passes upward through the tube further traces of moisture are gradually'extracted until the gas passing through the egress tube 6 is reheved or the greater portion of its moisture. For the purpose of drying hydrogen for the reduction'of tungsten I have'found it preferable to pass this gas serially'through two or more tanks such as herein described, though I have found that the quantity of moisture collected in other than the first of these tanksis so small that the tanks may be run for months without the necessity. of refil-lin in the water the solution trickles through As the calcium chlorid becomes disso ved the screen at the base of the tank and drips into the well 7. Inasmuch as the moisture runs down the, tank by avity an dinas much as the moist gas s passing in the opposite direction and, therefore, in its most moistened condition comes into contact-with through the lower wlndow. Y'After a few the calcium chlorid at the base of'the tank first, I find that the calciumv chlorid disappears-from the tank by the absorption of moisture almost entirely from the bottom. When the tank is first filled the calcium chlorid can be seen at each of. the observation Windows. After the tank has' beenoperated for a suflici ent length of time the calcium chlorid can no longer be seen hours'of operation the calcium chlorid can no longer be seen throughthe'second window from the bottoml In this mannerthe calcium 'chlorid forms a dome of moist" mathe space below the c'aleium chloridextends the fullheight; of the tank, or rather. untilitext ends to a point opposite the-uppermost.

window.

y The size'of the calciumchlorid drier has "been. so calculated that the first tank in the series'of four must be refilled once for each I days. drying operation and-thejwell is made .of such sizeas to hold that. quantity of calcium chlorid in concentrated solutionwhieh filledjthe entire tank-when-inthe'for'm of 'gloo'sely packedlumps. In orderto refill the tankthe :cap 5 is removed, thesniall" dome 'of' calcium; chlorid remaining at} the top isbroken down, and suflicient. crystals fwitnesses: poirediin on} top to "completely refill the 7 f Y v What I claim as new and desire to secure I v by Letters Patent of the United States is:

' 1. A calcium chlorid drier for circulating gases comprising a long and slender iron tube having observation windows, one at the bottom and another at the top, a. gas ingress pipe. near the bottom window, said tube being provided with a removabledrip pan or well wholly below the gas ingress pipe;- u I t A calcium chlorid drier for circulating' gases comprising a long and slender vertical metal tube having a perforate partition near the bottom thereof-for support- 'ing crystals of calcium chlorid, and a well,

detachably seeured to the base of the tube and adapted to be bodily removed'with'out disturbing the calciuin -chl-orid within the 3. v.A chemical drier-for circulating gas es ingress pipe near the bottomofthe tube, and ages. egress pipenear the top thereof,

and'a well detachably' secured to the baseof chemical. V v p In wltness whereof, I hereunto subscrlbe my name. this 21st day of July, 3., 1916.

CARL 'AQ PFANSTIEHL.-

: E. M. CON-RAD, G. C. SANeoRn.

55 comprising a long and slender vertically mounted metal tubehaving a plurality of observation windows therein for observing v thecondition of the drying chemical, a gas I the tube for colluublng the dissolved-drying 

